Pension And Other Postretirement Benefit Plans (Tables)

9 Months Ended

Dec. 31, 2022

Retirement Benefits [Abstract]

Components of Company's Net Periodic Benefit Cost

The components of the Company’s net periodic benefit cost were as follows:

	Pension Benefits				Other Postretirement Benefits
	Three Months Ended December 31,				Three Months Ended December 31,
(in thousands of dollars)	2022		2021		2022		2021
Service cost	$	1,549	$	1,678	$	33	$	43
Interest cost	2,341		2,212		236		265
Expected return on plan assets	(3,323)		(3,373)		(18)		(21)
Net amortization and deferral	1,001		976		(168)		(115)
Net periodic benefit cost	$	1,568	$	1,493	$	83	$	172

	Pension Benefits				Other Postretirement Benefits
	Nine Months Ended December 31,				Nine Months Ended December 31,
(in thousands of dollars)	2022		2021		2022		2021
Service cost	$	4,597	$	4,981	$	97	$	137
Interest cost	7,027		6,725		712		745
Expected return on plan assets	(9,971)		(10,145)		(56)		(65)
Net amortization and deferral	3,003		2,928		(507)		(346)
Net periodic benefit cost	$	4,656	$	4,489	$	246	$	471